Question
Ribbon L is four times as long as Ribbon M. Ribbon M is 31 cm shorter than Ribbon N. Ribbon N is 68 cm shorter than Ribbon L. How long is Ribbon M?
4 m

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Ribbon L is four times as long as Ribbon M. Ribbon M is 31 cm shorter than Ribbon N. Ribbon N is 68 cm shorter than Ribbon L. How long is Ribbon M?